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Followig is the code showing how to use underscore in numeric literals in Java −Example Live Demopublic class Demo{ public static void main (String[] args) throws java.lang.Exception{ int my_num_1 = 6_78_00_120; System.out.println("The number is : " + my_num_1); long my_num_2 = 2_00_11_001; System.out.println("The number is : " + my_num_2); float my_num_3 = 4.01_981F; System.out.println("The number is : " + my_num_3); double my_num_4 = 12.89_46_061; System.out.println("The number is : " + my_num_4); } }OutputThe number is ... Read More
Using a predefined class name as a class nameLet us see an example −Example Live Demopublic class Number{ public static void main (String[] args){ System.out.println("Pre-defined class name can be used as a class name"); } }OutputPre-defined class name can be used as a class nameThe class Number has a main function that displays a message when it is executed. The main function takes string values as arguments.Using a predefined class name as a variable nameLet us see an example −Example Live Demopublic class String{ public static void main (java.lang.String[] args){ System.out.println("Pre-defined class name ... Read More
The @JsonUnwrapped annotation can be used to unwrap values during the serialization and deserialization process. It helps to render the values of a composed class as if it belongs to the parent class.Syntax@Target(value={ANNOTATION_TYPE, FIELD, METHOD, PARAMETER}) @Retention(value=RUNTIME) public @interface JsonUnwrappedExampleimport com.fasterxml.jackson.annotation.JsonUnwrapped; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.core.JsonProcessingException; public class JsonUnwrappedAnnotationTest { public static void main(String args[]) throws JsonProcessingException { ObjectMapper mapper = new ObjectMapper(); String jsonString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(new Employee()); System.out.println(jsonString); } } class Employee { public int empId = 110; public String empName = "Raja Ramesh"; @JsonUnwrapped ... Read More
To sort user-defined object in Java, the code is as follows −Example Live Demoimport java.io.*; import java.util.*; public class Demo{ static void sort_objects(String my_data){ String[] my_vals = my_data.split(" "); Map my_map = new TreeMap(); for (int i = 1; i < my_vals.length; i += 2){ int my_age = Integer.parseInt(my_vals[i]); String name = my_vals[i - 1]; if (my_map.containsKey(my_age)){ ArrayList my_list = my_map.get(my_age); my_list.add(name); ... Read More
This example demonstrates how to lay out Views in RelativeLayout programmatically in Android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javapackage com.app.sample; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.RelativeLayout.LayoutParams; import android.widget.Toast; public class MainActivity extends Activity { RelativeLayout relativelayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ... Read More
Unreachable code error occurs when the code can’t be compiled due to a variety of reasons, some of which include: infinite loop, return statement before the unreachable line of code.Let us see an example −Example Live Demopublic class Demo{ public static void main(String args[]){ int val = 5; for (;;){ if (val == 5){ break; System.out.println("If the condition is not true, this line would be printed. "); } } } ... Read More
The @JsonDeserialize annotation is used to declare custom deserializer while deserializing JSON to Java object. We can implement a custom deserializer by extending the StdDeserializer class with a generic type Employee and need to override the deserialize() method of StdDeserializer class.Syntax@Target(value={ANNOTATION_TYPE, METHOD, FIELD, TYPE, PARAMETER}) @Retention(value=RUNTIME) public @interface JsonDeserializeIn the below program, we can implement a custom deserializer using @JsonDeserialize annotationExampleimport java.io.*; import com.fasterxml.jackson.core.*; import com.fasterxml.jackson.databind.*; import com.fasterxml.jackson.databind.annotation.*; import com.fasterxml.jackson.databind.deser.std.*; public class JsonDeSerializeAnnotationTest { public static void main (String[] args) throws JsonProcessingException, IOException { Employee emp = new Employee(115, "Adithya"); ObjectMapper mapper = new ObjectMapper(); ... Read More
This example demonstrates how do I send in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import android.Manifest; import android.content.pm.PackageManager; import android.os.Bundle; import android.telephony.SmsManager; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity { Button btnSend; EditText editTextNum, editTextMsg; private static final ... Read More
The @JSON annotation is used by JSONSerializer class to exclude or include a field during the serialization process. We can use the serialize() method of JSONSerializer class to perform a shallow serialization of the target instance.Syntax@Retention(value=RUNTIME) @Target(value={FIELD, TYPE, METHOD}) public @interface JSONExampleimport flexjson.JSONSerializer; import flexjson.JSON; public class JSONAnnotationTest { public static void main(String[] args) { JSONSerializer serializer = new JSONSerializer().prettyPrint(true); Employee emp = new Employee("Raja", "Ramesh", 30, "Hyderabad"); String jsonStr = serializer.serialize(emp); System.out.println(jsonStr); } } // Employee class class Employee { private String firstName, lastName, address; private ... Read More
Bakhshali approximation is a method of computing the square root of a number which is not a perfect square. Now, lets brush-related terms to easily understand the concept.Square root of a number x is a number that satisfies the following condition, y2 = x.Perfect Square is a number whose square roots are w. For example 16 is perfect square as its roots are 4 and 4.There are multiple methods defined mathematically to find the square root of a number. In this tutorial, we are going to learn about Bakhshali approximation to find the square root of a number.It is a ... Read More